Cowell spoke to ET ahead of his new show, 'AGT: Extreme' about his own accident on an electric bike.
Oscar Isaac will also host an episode of the series.
The news comes ahead of the acclaimed series' return with season 3 in March.
The fourth season of the Netflix sci-fi series will air in two parts.
See Lily James and Sebastian Stan turn into Pamela Anderson and Tommy Lee in Hulu’s hottest new miniseries.
Additionally, the series stars Michelle Pfeiffer as Betty Ford, and Gillian Anderson as Eleanor Roosevelt.
It's a 'battle of the big girls' as Lizzo searches for her next backup dancers.
'Inventing Anna' actor, Anders Holm, shares his thoughts to ET about the limited series' leading lady, Anna Sorokin.
The 'Law & Order' stars revealed why things have felt 'so good' ahead of the 1-year anniversary of their onscreen reunion.
Shanna Moakler opens up to ET after being evicted from the 'Celebrity Big Brother' house. New episodes air weekly on CBS.
The actor joins 'The Proud Family: Louder and Prouder' as Michael.
Darcey gets the romantic proposal of her dreams in front of her daughters.
In ET's exclusive clip, Christine explains how her dynamic with Kody changed after she started to say 'No' to him.
In ET's exclusive look at TLC's 'Sister Wives: One on One' special finale, Christine shares why her marriage changed with Kody.
