Robert Downey Jr. had one of the most incredible comebacks in cinema history back in 2008. Downey’s career was seemingly unsalvageable in the early 20th century following a string of financial disappointments and personal scandals. However, the Chaplin star made a major comeback when he appeared in both Iron Man and Tropic Thunder in the same year, receiving commercial success for the former and critical acclaim for the latter, including an Oscar nomination.