Leonardo TMNT 2012

After several years, Leo managed to start a family: he had a wife and a son. His brothers had also made their own lives, except for Donnie, who remained single.

One night, Donnie noticed something enormous approaching the atmosphere, but his brothers dismissed it. Leo went out on patrol with them, unaware of the impending tragedy.

Krang attacked, launching a massive mutagen bomb at Earth. Leo sacrificed himself to protect it, taking much of the impact.

Earth descended into mutant chaos. Donnie found Leo gravely injured and carried him to the sewers, where his wife waited in tears.

Leo had survived… but the impact had caused him to lose his memory. He no longer remembered his own family.