Robert Downey Jr. has been something of a "mentor" to his MCU co-stars and they go to him for advice.

The 58-year-old actor, who has battled addiction and been in both rehab and jail in the past, has served as a "mentor" to his fellow stars in the Marvel Cinematic Universe (MCU) and has always been happy to offer them guidance and support, including at the 'Captain America' star's nuptials to Alba Baptista in September.