MTL - My Cold and Beautiful Wife - Chapter 4291 true emperor

Objects from beyond the Earth have fallen; eyes of crimson see through the cosmos.All the stars in the sky are enemies of humanity.They call me a false god, but only I fly above.The world is sick, gravely so.I will heal it.

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

Ethen Cole travels to an era where everyone battles with pets. In a world revived by spiritual energy, danger and madness run rampant. Humanity relies on battle pet masters to establish bases and unite for survival.Before the college entrance examination, Ethen Cole is framed and expelled from school, losing his chance to study at the Battle Pet Academy. Just as he feels despair, the Battle Pet System for battle pets activates.“Ding! The Blue Riolux has evolved into a Emerald eyed Riolux!”From then on, Ethen Cole begins his legendary career as a battle pet master.

After waking up, Bei Chen bit the bullet and became the leader of a certain group. On the first day of taking over the organization, the old housekeeper introduced Bei Chen to the three core cadres of the organization.

“Master, this is Coulson, and the two next to him are Natasha and Mei. They are the backbone of the organization.”

Beichen: “…”

All undercover? Going in through time travel?

Fortunately, the system was awakened at a critical time. As long as it is summoned and contained, it can get rich system rewards.

Ding~ Congratulations to the host for successfully taking in the Crimson King and gaining the power of supreme divinity! The Scarlet King in full force.

Ding ~ Congratulations to the host for successfully containing the son of evolution, and gaining the power of fusion evolution and transformation!

finally! Beichen, who possesses thousands of abilities, has become the most indescribable existence in the multiverse!

- Description from novelbuddy