Robert Downey Sr., the younger Downey made his acting debut at age five, playing the ironic role of a sick puppy n his father’s film “Pound.” Downey Jr. found early success as an adjunct member of the Brat Pack, starring in the nihilist classic “Less Than Zero.” He earned his first Oscar nomination for his portrayal of Charlie Chaplin in the eponymous film. Downey has famously, and publicly, battled substance abuse, spending much of the 90’s and early aughts in and out of treatment centers and correctional facilities before finally getting sober in 2003 and making the unlikely leap from getting high to becoming the highest paid actor in Hollywood.